Do I need an Apple TV to install, connect and control my Sensi thermostat?

No. You can connect and control your Sensi thermostat with the Sensi mobile app. In order to control your Sensi thermostat from your mobile device, you’ll need a registered Sensi account with the Sensi app installed on your mobile device.

If you want to control your Sensi thermostat with Apple HomeKit and the Apple Home app away from your home, you’ll need an Apple TV (3rd generation) with tvOS 9.0 or later.

Read more about controlling your HomeKit-enabled devices away from your home on Apple’s website. Here you will find helpful information on set up, automations, allowing access, and troubleshooting.